FBI Evidence Collection & Preservation 2

Question 1

When collecting trace evidence from a shooting victim's clothing, what technique should be used first before removing the garment?

Accepted Answer

Photograph and tape-lift trace evidence in place

Answer

Photographing and tape-lifting trace evidence in place prevents loss or contamination before the garment is removed or packaged.

Question 2

What is the primary reason firearms evidence should be packaged in paper rather than plastic bags?

Accepted Answer

Paper allows moisture to escape, preventing mold and DNA degradation

Answer

Paper packaging is breathable, allowing moisture to escape and preventing the growth of mold that could destroy biological evidence.

Question 3

An agent discovers a handgun submerged in a pond. What is the correct initial handling procedure?

Accepted Answer

Package the firearm with water in a sealed container to preserve evidence

Answer

Submerged firearms should be kept wet in their recovered state to preserve fingerprints and DNA that would be destroyed by drying.

Question 4

What does the term 'locard's exchange principle' mean in the context of crime scene evidence?

Accepted Answer

Every contact between two objects leaves a trace on each

Answer

Locard's Exchange Principle states that every contact leaves a trace — the perpetrator takes something from and leaves something at the scene.

Question 5

During a shooting scene investigation, bullet trajectory rods are used primarily to:

Accepted Answer

Establish the angle and direction from which shots were fired

Answer

Trajectory rods are inserted into bullet holes to visually establish the angle and potential origin point of each shot.

(FBI) Federal Bureau of Investigation Certified Marksman Practice Test